[R] Building a random walk vector

Matthew Wilson matt at overlook.homelinux.net
Fri Aug 4 03:17:15 CEST 2006

I'm studying R in my free time.  I want to build a vector where each
element is equal to the element before it in the sequence plus some
random tweak.

In python, I would write:

vec = [100] * 50 # make a 50-element list with each element set to 100
from random import randint
for i, v in enumerate(vec):
    if i is not 0: # if we're not on the first element
        vec[i] = vec[i-1] + randint(-2, 2)

I suspect R has some fancier way of doing this.  How to?


A better way of running series of SAS programs:

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